Bottom-up construction of highly photoactive dye-sensitized titania using Ru(II) and Ir(III) complexes as building blocks

Rico-Santacruz, Marisa; Sepúlveda, Ángel E.; Ezquerro, Cintia; Serrano, Elena; Lalinde, Elena; Berenguer, Jesús R.; García‐Martínez, Javier

doi:10.1016/j.apcatb.2016.06.061

Cited by 13 publications

(27 citation statements)

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“…The details are described elsewhere. 52,53 Briefly, a solution of the synthesized Ru(II) complex in 2 ml of absolute EtOH (0.04 g, 0.06 mmol) was added to 5 g (14.7 mmol) of TBOT. The mixture was stirred during 30 minutes and then dissolved in 35 ml of absolute ethanol, under magnetic stirring.…”

Section: Preparation Of the Hybrid Tio2_ru_ismentioning

confidence: 99%

“…1 and S1, ESI) containing the Ru(II) N3 dye inside them are obtained. [52][53][54][55] Two aspects constitute the major thrust of this work. Firstly, devices with electrodes featuring a mixture of P25 and small nanoparticles show an increase of the device efficiency due to an enhanced interconnection between nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

“…S1, ESI). 52,53 In addition, the integration of the dye in the titania structure protects the electrode against electrolyte corrosion due to the significantly reduction of the electron recombination process.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, this approach might be applicable to any kind of dyes allowing for tuneable light absorption features of the device, while still retaining exceedingly high lifetimes and efficiencies. [52][53] Results and discussion Low-temperature DSSCs based on P25:TiO2_Ru_IS electrodes. As a first step towards the preparation of lt-DSSCs, we followed previous works investigating the optimal amount of hydrochloric acid (HCl) as nanoparticle binder with commercial P25 titania to fabricate reference devices -see Experimental Section for details.…”

Section: Introductionmentioning

confidence: 99%

“…In short, we demonstrate how to combine non hybrid TiO2-based nanoparticles (NH; 8 nm), commercially available P25 TiO2, and a newly developed dyehybrid TiO2 nanoparticles (TiO2_Ru_IS; 8 nm), 52,53 in which the Ru(II) N3 dye is incorporated into the structure of the titania nanoparticle, to fabricate single, and/or multi-layered electrodes for superior lt-DSSCs (see Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

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Hybrid Dye‐Titania Nanoparticles for Superior Low‐Temperature Dye‐Sensitized Solar Cells

Kunzmann

Valero

Sepúlveda

et al. 2018

Advanced Energy Materials

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This work reports on a new strategy to design low-temperature (≤ 200°C) sintered dye-sensitized solar cells (ltDSSCs) with enhanced charge collection efficiencies (coll), photoconversion efficiencies, and stabilities under continuous operation conditions. This is accomplished by integrating into the electrodes a new class of hybrid mesoporous Ru(II) complex-TiO2 nanoparticles (TiO2_Ru_IS), obtained by in-situ bottom-up construction of dyesensitized titania using the Ru(II) N3 dye as building blocks. The most important assets of the TiO2_Ru_IS hybrid nanoparticles are i) a remarkable dye stability due to the integration of the dye within the anatase network and ii) a small nanoparticle size to enhance charge transport/collection processes. The latter is encouraging for tackling the two main bottlenecks in lt-DSSCs, that is, moderate efficiencies and low device stabilities. Our results evidence that devices with electrodes featuring a mixture of P25 and TiO2_Ru_IS show an enhanced charge transport and reduced electron recombination processes. The incorporation of TiO2_Ru_IS into the electrode leads to an increase ofcoll from 46% for P25 reference up to 60% for P25:TiO2_Ru_IS (80:20 wt%) device. As a final optimization, TiO2_Ru_IS was also applied as a top layer in a multi-layered device architecture, leading to coll of around 74%. The latter result in lt-DSSCs featuring efficiencies of 8.75% and lifetimes of 600 h under device operation conditions.

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Section: Preparation Of the Hybrid Tio2_ru_ismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hybrid Dye‐Titania Nanoparticles for Superior Low‐Temperature Dye‐Sensitized Solar Cells

Kunzmann

Valero

Sepúlveda

et al. 2018

Advanced Energy Materials

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Hybrid Amino Acid‐TiO₂ Materials with Tuneable Crystalline Structure and Morphology for Photocatalytic Applications

Sarigul

Chamorro-Mena

Linares

et al. 2021

Advanced Sustainable Systems

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TiO 2 (A), presents remarkable properties under UV light, which are very useful in photo-oxidation reactions. Some of these are, its chemical stability, low cost, availability, and low toxicity. [2] However, as it is widely known, it presents limited photoactivity under visible light. We have recently described a novel strategy, based on the in situ incorporation of organic moieties or metallic complexes during the synthesis of titania, which drastically enhances its photocatalytic efficiency under sunlight irradiation. [3][4][5][6] By using this strategy, a series of visible light-activated hybrid anatase nanoparticles have been produced by the in situ incorporation of organic compounds such as p-phenylenediamime, as well as Ru(II) or Ir(III) complexes, among others, to titania, using water and ethanol as solvents. [3][4][5] This methodology yields materials with a reduced band gap, absorption edges in the visible light, and outstanding stability; all of these features synergistically contributing to enhancing their photoactivity. [3][4][5][6] Furthermore, the integration of our hybrid titania containing the Ru(II) N3 dye into a photoelectrode of a low-temperature dye-sensitized solar cells (lt-DSSC) yielded the highest efficiency reported to date for titania-based lt-DSSCs (8.75%). [7] Very recently, we have reported the first biphasic rutilebrookite organotitania nanoparticles synthesized under mild conditions using 1,10-phenanthroline as both crystal modifier and as a source of intermediate N2p levels. Owing to these features, the hybrid organotitanias exhibit outstanding photocatalytic activity under visible light irradiation. [6] In light of these results, we decided to extend our approach to other morphologies and synthetic conditions, by incorporating other organic compounds. In this contribution, we report the synthesis, characterization, and catalytic testing of a series of hybrid amino acid-titania anatase nanoparticles and rutile nanorods with enhanced photo catalytic activity under visible light irradiation.Amino acids can be effectively incorporated in titania by coordinating their amine and carboxylic groups to the titanium atom of the titania precursor. [8,9] In fact, different amino acids have been used as shape-modifiers in the synthesis of brookite and rutile titanias, prepared with titanium metal powder and ammonia solutions. [8] The photodeposition of Pt co-catalyst on the surface of the as-synthesized brookite particles led A method to produce hybrid organotitanias, both as thin films and suspensions, showing excellent photocatalyic activity in the degradation of organic dyes in aqueous solutions under visible light irradiation is disclosed. This method is based on the in situ incorporation of an amino acid, l-tyrosine, during the synthesis of the titanias owing to its coordination and co-condensation with the titania precursor under acidic conditions. This methodology allows the fine -tuning of their crystalline structure, size, and shape by simply varying the pH of the synthesis gel, leadi...

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Visible‐Light‐Activated Black Organotitanias: How Synthetic Conditions Influence Their Structure and Photocatalytic Activity

et al. 2018

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A series of low‐temperature, visible‐light‐activated black organotitanias were synthesised through a sol–gel strategy that allowed the in situ incorporation of p‐phenylenediamine (PPD) into the framework of anatase nanoparticles. The effect of the synthetic conditions on the crystalline structure and photocatalytic activity of these materials was assessed by several characterisation techniques, which revealed a small crystalline domain size (4.6–5.5 nm), effective incorporation of PPD inside the nanoparticles, and a significant reduction in the band gap of these materials (from 3.2 to 2.7–2.9 eV). A systematic study of the synthetic parameters also allowed a significant reduction of the solvent used for the preparation of these black organotitanias (20‐fold), as well as the crystallisation time, without compromising the structural properties and photocatalytic activity of these materials. The organotitanias with the highest PPD content and high crystallinity result in the best performing materials in the photocatalytic degradation of rhodamine 6G under both UV‐ and visible‐light irradiation.

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Bottom-up construction of highly photoactive dye-sensitized titania using Ru(II) and Ir(III) complexes as building blocks

Cited by 13 publications

References 50 publications

Hybrid Dye‐Titania Nanoparticles for Superior Low‐Temperature Dye‐Sensitized Solar Cells

Hybrid Dye‐Titania Nanoparticles for Superior Low‐Temperature Dye‐Sensitized Solar Cells

Hybrid Amino Acid‐TiO₂ Materials with Tuneable Crystalline Structure and Morphology for Photocatalytic Applications

Visible‐Light‐Activated Black Organotitanias: How Synthetic Conditions Influence Their Structure and Photocatalytic Activity

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Bottom-up construction of highly photoactive dye-sensitized titania using Ru(II) and Ir(III) complexes as building blocks

Cited by 13 publications

References 50 publications

Hybrid Dye‐Titania Nanoparticles for Superior Low‐Temperature Dye‐Sensitized Solar Cells

Hybrid Dye‐Titania Nanoparticles for Superior Low‐Temperature Dye‐Sensitized Solar Cells

Hybrid Amino Acid‐TiO2 Materials with Tuneable Crystalline Structure and Morphology for Photocatalytic Applications

Visible‐Light‐Activated Black Organotitanias: How Synthetic Conditions Influence Their Structure and Photocatalytic Activity

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Hybrid Amino Acid‐TiO₂ Materials with Tuneable Crystalline Structure and Morphology for Photocatalytic Applications